A double focusing X-ray camera for use with synchrotron radiation

Hendrix, J.; Koch, Michel H. J.; Bordas, J.

doi:10.1107/s0021889879013042

Cited by 131 publications

(36 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It does not touch the primary beam and therefore does not need to be included in the beamline analysis. Apart from the relative positions of mirror and monochromator, the present set-up is equivalent to those described by Yoda (1984), Furuno, Sasabe & Ikegami (1987), Hayashi, Hamada, Suehiro, Masaki, Ogawa & Miyaji, (1988) and Riekel & Suortti (1991) for rotating-anode sources and those described by Barrington Leigh & Rosenbaum (1974), Webb, Samson, Stroud, Gamble & Baldeschwiler (1977), Hendrix, Koch & Bordas (1979) and Amemiya, Wakabayashi, Hamanaka, Wakabayashi, Matsushita & Hashizume (1983) for synchrotron-radiation sources. We have chosen this set-up as it is the most common, even though it employs a perfect-crystal monochromator and that the resolution function due to this has a very small contribution from the wavelength spread.…”

Section: Examplementioning

confidence: 99%

“…The numerical example calculated in the following is based on the set-up described by Hendrix et al (1979) using the storage ring DORIS at DESY in Hamburg as radiation source. For the flux measurements performed by Hendrix et al, the ring was • l rad -2 mm-2 operated at 4-7 GeV at a current of 20 mA.…”

Section: -(Z3mentioning

confidence: 99%

“…This agrees quite well with the value qb = 5+_2 x l011 photons s -! measured by Hendrix et al (1979) using a calibrated ion chamber. Table 2 further includes the parameters for the resolution function for different (q) values, both with and without the spatial resolution of the detector included.…”

Section: -(Z3mentioning

confidence: 99%

See 2 more Smart Citations

Resolution function and flux at the sample for small-angle X-ray scattering calculated in position–angle–wavelength space

Pedersen¹

1991

J Appl Cryst

View full text Add to dashboard Cite

A method for calculating the flux at the sample position and the resolution function based on the general description of synchrotron X-ray beamlines in position-angle-wavelength space has been developed. A mathematical formulation is presented, in which source, transmission function for the slits and acceptance windows of the monochromator crystals are approximated by Gaussian functions. These approximations allow all of the algebra in connection with combining the different contributions to be done analytically. When the beam passes the various components of the beamline, such as flight paths, monochromators and mirrors, it results in coordinate transformations in parameter space. By inserting the transformations in the intensity distribution of the source, transmission functions of the slits and acceptance windows of the monochromators, these are transformed to the position of the sample. Their product gives the intensity distribution at this position and from this the resolution function in reciprocal space is calculated. The resolution of the detector is easily included by a convolution. The transmissions of the slits and the acceptance windows of the monochromator crystals have been normalized to give the same integrated transmission and reflectivities as the functions they approximate. Therefore the flux at the sample position can be calculated by multiplication of the brilliance of the source and the result obtained from an integration of the distribution over the two position parameters, the two angle parameters and the wavelength. The theory has been applied to an example and gives reasonable results for sample intensity and resolution function.

show abstract

Section: Examplementioning

confidence: 99%

Section: -(Z3mentioning

confidence: 99%

See 1 more Smart Citation

Resolution function and flux at the sample for small-angle X-ray scattering calculated in position–angle–wavelength space

Pedersen¹

1991

J Appl Cryst

View full text Add to dashboard Cite

show abstract

“…Mirrors present severe technological problems because the small angles of incidence mean that they must be long, of the order of a few metres, and even segmented mirrors are difficult to support and align. Double focusing has been achieved on the storage ring DORIS (Hamburg, Federal Republic of Germany), where a photon flux of 5___ 2 x 10 xx photons s-1 in a focal spot of 1.1 mm diameter was measured (Hendrix, Koch & Bordas, 1979), but the focal region was surrounded by a high background area of 200 mm 2, caused by stray radiation scattered from the various components placed in the optical path. A toroidal mirror and double germanium crystal monochromator have been used at SPEAR (Stanford, USA) by Hastings, Kincaid & Eisenberger (1978) to produce double focusing; however, economic considerations may prevent further use of toroidal mirrors because of the difficulties in manufacture.…”

Section: Discussionmentioning

confidence: 99%

A pilot study of the use and unfocused monochromatic radiation from a storage ring in powder diffraction

Thompson¹,

Glazer²,

Albinati³

et al. 1981

J Appl Cryst

View full text Add to dashboard Cite

The results of a trial powder diffraction experiment on the ADONE storage ring at the Frascati National Laboratories (Italy) are described. A (220) channel-cut Si crystal was used to provide a monochromatic beam and it was demonstrated that Debye-Scherrer photographs could be obtained in several hours. It was also shown that very high resolution can be obtained simply by increasing the camera dimensions. Finally, it is shown that with the higher fluxes of the SRS at the Daresbury Laboratory (England) very fast exposures will be possible without the need for focusing.

show abstract

“…3). This principle has since been incorporated with a different mechanical design in monochromators used at EMBL, Hamburg (Hendrix, Koch & Bordas, 1979) and at SRS, Daresbury (Helliwell & Worgan, 1979). The whole optical path is under vacuum.…”

Section: Monochromatormentioning

confidence: 99%

Macromolecular crystallography with synchrotron radiation: photographic data collection and polarization correction

Kahn¹,

Fourme²,

Gadet³

et al. 1982

J Appl Crystallogr

View full text Add to dashboard Cite

The design and operation of a focusing camera for high-resolution macromolecular crystallography with synchrotron radiation (SR) are described. The performance of this service-oriented instrument is evaluated on the basis of five years of use. Standard procedures for data collection, data processing and data reduction have been modified to take unusual features of the SR source into account; the effect of polarization is thoroughly discussed.

show abstract

A double focusing X-ray camera for use with synchrotron radiation

Cited by 131 publications

References 6 publications

Resolution function and flux at the sample for small-angle X-ray scattering calculated in position–angle–wavelength space

Resolution function and flux at the sample for small-angle X-ray scattering calculated in position–angle–wavelength space

A pilot study of the use and unfocused monochromatic radiation from a storage ring in powder diffraction

Macromolecular crystallography with synchrotron radiation: photographic data collection and polarization correction

Contact Info

Product

Resources

About